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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2008-05-03 18:29:28 +0200
committerIngo Molnar <mingo@elte.hu>2008-05-05 23:56:18 +0200
commit3e51f33fcc7f55e6df25d15b55ed10c8b4da84cd (patch)
tree3752f9ea8e014ec40e95a1b197b0a3d18e1056a8 /init/Kconfig
parenta5574cf65b5f03ce9ade3918764fe22e5e2371e3 (diff)
downloadlinux-3e51f33fcc7f55e6df25d15b55ed10c8b4da84cd.tar.bz2
sched: add optional support for CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
this replaces the rq->clock stuff (and possibly cpu_clock()). - architectures that have an 'imperfect' hardware clock can set CONFIG_HAVE_UNSTABLE_SCHED_CLOCK - the 'jiffie' window might be superfulous when we update tick_gtod before the __update_sched_clock() call in sched_clock_tick() - cpu_clock() might be implemented as: sched_clock_cpu(smp_processor_id()) if the accuracy proves good enough - how far can TSC drift in a single jiffie when considering the filtering and idle hooks? [ mingo@elte.hu: various fixes and cleanups ] Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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